Door lock



Jul 27, 1943. 8; BOCK 2,325,220

DOOR LOCK Original Filed Jan. 16, 1941 Patented July 27, 1943 j (lharles stBockiChicago,Ill'gassigmn .1 t Hofiman, Chicagm lllug v w iii i 94 invention relates t door lo tic'ularly to those which are applicab e emergency doors; to enable them to be opened for purposes of esca' pdfand myinain" ob j'ect'is to provide ailock of" this type whi'bh'is proof to tampering or.disablingdnfluencesi A further object 'of tl'i'e'inventionEisfto design the novellockalohg lines to p evenmernmmg it te ei'abaiidonedapplication Se rial lilo.

mini s, 1941., T is application rialfNo. 441,84 i

, Its-e s te l-ta te; be

ticl'es'having'awedgingorfblockin'gtendency.

Another object'of "the invention is'to improve locks of the type contemplated with simple mean to accomplish the intended urpose; With the above objects in view and any others which may suggest themselvesfrom the-descrip' tion to follow, a bettefuntlersta'ndin'g "of" thein vention may be had by reference to the ac'c'oiii' panying drawing," which Fig. 1 is an elevation of the improved lock with 1 its bolt projected;

Fig. 2 is an enlarged side View from the right of the showing in Fig. 1;

Fig. 3 is a section on the line 33 of Fig. 2,.

traction of the bolt lock when actuated, and enabling the door to be pushed wide open. When the door is again closed, the' bolt, being of the latch type, automatically snaps into locked position, and there is no way to open the door from the outside.

Obviously, it is the intention that a door of the above type be used for escape purposes only, and not for entrance purposes at any time. However,

I have found that where the installation is used a in schools the lock is tampered with after the door has opened for exit purposes, so that it will not lock when again closed. The usual method of tampering is to jam the bolt in the retracted position by means of inserting a pin, toothpick or other blocking article between the bolt and its bearing, so that the bolt will be inactive when the door assumes the closed position, enabling the door to be opened from the outside. It has therefore been my intention to so modify the construction of the lock as to prevent the application of racticecompiainee'df.

ente -m ths drawing indicates aftypica I I epeating 'injoiie-"of its end faces -I 2; dated particularly 'in Fig. generally triangiiIarTfor I at "I 3 111 the housing 'of "the lock! -'A1s'6-'the bit is normally advanced or projected by a stir spring mechanism Hi, the particular chafacter of thisiriechanis'm be" g'f' "con'daiy'impdrtarice in thpresntinst e; I I bolt should be' pi oj'e'ctd totliefposition"indicated and rtra'ctal'ele'to the"position{ I I I yfpressure e a eontar usii plate l 5 which is) pivoted-at, ito" thedocklioiis ing, the means for accomplishing this being of any suitable type.

:One feature of the present invention lies in the Zone of the outer wall It along the inner side of which the bolt describes its arcuate travel. In the conventional lock; the said wall is fairly close to the periphery of the bolt, and it is in the tiny space there located that the pin, toothpickor other jamming article is inserted or wedged as the bolt is. held in the retracted position. .In order to prevent jamming of the lock in this manner, I have cut away the 'Wall I6 from the front a short distance, as indicated at I1; also, the

wall is located more distantly from the periphery of the bolt l l. The stock of the housing at points above and below the bolt is then perforated as indicated at I8 to journal the spindle H1 or a vertical roller 20 in a manner to place the roller in contact with the periphery of the bolt. vThis feature is more fully covered in my Patent No. 2,241,109, datedMay 6,1941.

My present application is a substitute for an application filed by me Jan. 16, l94=1.-un der Ser. No. 374,779 and since abandoned, deals more particularly with the Zone in the top and bottom closures of the bolt with the housing. Thus, the

conventional lock shows a slight clearance space above and below the bolt in respect to the said entrance, and either of these spaces has been employed by tamperers to jam the bolt in the retracted position. I have found that where the extent to which theinsertion of a pinor toothpick may be possible is very short, the power of the spring behind the bolt will advance the same despite the impediment and dislodge the same. To accomplish'this, I have cut the bolt down from its top and bottom a short distance to apas clearly shown in Fig. 4. Thus, if any slight spaces or cracks occur between the top or bot} tom of the bolt and the housing entrance, the insertion of any sharp article or obstruction will soon meet the back or seat of the corresponding: receptacle 24 and be prevented from further I The short hold on the bolt thus gained progress.

will be insumcient to hold it against" the urge of the internal spring, and the bolt willemerge despite the interference.

It will be apparent that the; feature just ascribed will counteract attempts to janithebhlli from the top or bottom and soon discourage the tamperer. At the same time, the featureis of-- simple construction, requires no extra parts, and involves nothing of a delicate, 'charactertoget out of adjustment or require repairz. .2 Q HWhile I- have described the inventionfalong speciiiclines, it is apparent tha't minor changes or refinements may ,be made therein; without departing from its principle, and Ide'sire "to consider such changes ,andrefinements as coming withinfthescope 'andspiritpf the appended claims. v v p v rc r a a e 1. In a lock carried-by the closing end of a door" and having a vertically-pivoted latch bolt formed with an arcuate periphery; means between the vertical extremities of the boli and; the lock housing preventing more than the initial insertion of an instrument calculated to jam the bol t, said means comprising extensions of the bolt at such extremities, and shallow receptacles in the housing seating said extensions when the bolt is in the retracted position.

2. In a lock carried by the closing end of a door and having a vertically-pivoted latch bolt formed with an arcuate periphery; means between the vertical extremities of the bolt and the lock housing preventing morethan' the initial insertion of an instrument calculated to jam the bolt, said means comprising upward flanges of (the bolt vat such extremities, and shallow angleshaped receptacles in.the housing seating said flahgeswhen the bolt is in the retracted position. In alock. carried by the closing end of a door and having a vertically-pivoted latch bolt formed with an arcuate periphery; means be- Jtweenthe vertical extremities of the bolt and the lock Ihousing preventing more than the initial insertion of an instrument calculated to jam the bolt, said means comprising upward flanges of the bolt along its outer face at such extremities, and shallow 1 ang'le sha'ped receptacles in the housingseating said flanges when the bolt is in the retracted position. 4.111 a lock carried lbythe closing end of a door and having avertically pivoted latch bolt formed with an .arcuate periphery; means be-' tweenthe vertical extremities of the bolt and the lock housing preventing more than'the initial insertion of an instrument calculated to jam the bolt, said means'comprising extensions of the bolt at such extremities and shallow receptacles inx the housing seating said extensions whenthe bolt is in the retracted position, said extensions being. upward flanges of substantially square cross-section, and said receptacles beinganglee shaped.

CHARLES s. BOCK." 

